but nasa scientists are also focused on the future. as one of them put it, the wheels of curiosity have begun to blaze the trail for human footprints to mars. alex kirst, nhk world, pasadena, california. >>> tokyo electric power company executives have vowed to pressure and released some of the most important evidence from the early days of the nuclear disaster. they unveiled videos that document the efforts to deal with the meltdowns and explosions at the fukushima daiichi plant. tepco officials show the recordings to the media monday. select journalists will now be able to watch 150 hours of edited tape from march 11th to 16th, 2011. it tracks the back and forth conversations between workers at the nuclear plant and personnel at headquarters. tepco also released 90 minutes of edited video. >> the video show workers trying to contain the accident after a series of hydrogen explosions in the early days of the disaster confused them. company executives were also puzzled about the government's intervention in the crisis. tepco officials